A troponin test looks for certain types of the protein troponin, in your bloodstream. Those types of troponin only occur in heart muscle cells and only enter your blood because of heart muscle damage. That makes troponin invaluable in diagnosing heart attacks and other heart-related problems.
There are two types of troponin that are more detectable after heart muscle damage, which use the letters I and T to tell them apart.
Troponin I (cTnI). This kind of troponin is unique to heart muscle.
Troponin T (cTnT). Troponin T does exist in other types of muscle, but the amounts are very limited. The Troponin T in your heart muscle also has a slightly different structure, which doesn’t occur anywhere else in your body.
Troponin levels usually increase sharply within three to 12 hours after a heart attack and peak about 24 hours after the heart attack. They will also remain high for several days.
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